Gay, L. R. (1987). Educational research: Competencies for analysis and application (3rd ed.). Merrill.
Chicago-viite (17. p.)Gay, L. R. Educational Research: Competencies for Analysis and Application. 3rd ed. Columbus, Ohio: Merrill, 1987.
MLA-viite (9. p.)Gay, L. R. Educational Research: Competencies for Analysis and Application. 3rd ed. Merrill, 1987.
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